/*
 * Copyright (C) 2025 Huawei Device Co., Ltd.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

class EventBus {

  private eventMap: { [eventName: string]: Array<(data?: any) => void> } = {};

  on(eventName: string, callback: (data?: any) => void): void {
    if (!this.eventMap[eventName]) {
      this.eventMap[eventName] = [];
    }
    if (!this.eventMap[eventName].includes(callback)) {
      this.eventMap[eventName].push(callback);
    }
  }

  emit(eventName: string, data?: any): void {
    const callbacks = this.eventMap[eventName];
    if (callbacks) {
      callbacks.forEach(callback => {
        callback(data);
      });
    }
  }

  off(eventName: string, callback: (data?: any) => void): void {
    const callbacks = this.eventMap[eventName];
    if (callbacks) {
      const index = callbacks.indexOf(callback);
      if (index!== -1) {
        callbacks.splice(index, 1);
      }
    }
  }

  clearEvent(eventName: string): void {
    if (this.eventMap[eventName]) {
      delete this.eventMap[eventName];
    }
  }

  clearAllEvents(): void {
    this.eventMap = {};
  }
}

export const eventBus = new EventBus();